Subject: Fwd: MAGIC su New Scientist dell'8 settembre
From: "alessandro de angelis" <[email-masked]>
To: xyz <[email-masked]>, "AFAM account" <[email-masked]>
Date: Fri, 14 Sep 2007 17:17:24 +0200

Come responsabile scientifico di MAGIC devo dire che l'interpretazione va
oltre il risultato... Che spero sia per voi comunque interessante.

http://www.newscientist.com/channel/fundamentals/mg19526204.300-finally-a-magic-test-for-string-theory.html

Questa era la descrizione ufficiale che ho spedito in giro (un po' tecnica)

MAGIC detected a big gamma-ray flare in the galaxy Mkn501. The galaxy has a
black hole (BH) in the center, so the flare is probably due to a change in
its accretion rate (to simplify, a large mass falling in the BH). The
luminosiy of the galaxy doubled in 2 minutes. The arrival time of the
photons > 10 TeV was displaced by 4 minutes with respect to the arrival time
of the photons at about 100 GeV. This can be due to some peculiar dynamics
of the accretion process, or to a dependence of the speed of light on
energy. If we take tha last hypothesis, and we assume, as Amelino-Camelia
and Ellis, a dependence on the energy of the Quantum Gravity unification
scale E_QG such that v=c(1-E/E_QG), we obtain E_QG~0.03M_P, where M_P is the
Planck mass. I'ts a nice result - although it is not excluded that some
funny dynamics is at work... The paper is .
arXiv:0708.2889<http://xxx.lanl.gov/abs/0708.2889>

Cordiali saluti,
Alessandro
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